<!DOCTYPE html>
<html>
  <head>
    <meta charset="UTF-8">
    <title></title>
  </head>
  <body>
    <div id="app">
      <p>
        <span>{{foo}}</span>
      </p>
      <p>你好的</p>
      <span>{{poo}}</span>
    </div>
  </body>
  <script type="text/javascript" src="js/myVue.js"></script>
  <script type="text/javascript">
    var vm = new MyVue({
      el: "#app",
      data: {
        foo: 'bar',
        poo: 'great'
      }
    })
    setTimeout(function() {
      vm.data['foo'] = 'bar_change'
    }, 3000)
  </script>

</html>